Which statement about eosinophil granules is correct?

Which statement about eosinophil granules is correct?

• A. Blue
• B. Red
• C. Neutral or white
• D. Yellow

Answer: (B)

Eosinophil granules stain red because they are rich in basic proteins that bind strongly to the acidic eosin dye used in common stains. In Wright or Giemsa stains, this yields bright red or orange granules, a hallmark that helps distinguish eosinophils from other white blood cells. Basophil granules, in contrast, stain blue due to different constituents; neutral or white and yellow coloring don’t match the distinctive red appearance of eosinophil granules. So the correct statement is that eosinophil granules are red.

Eosinophil granules stain red because they are rich in basic proteins that bind strongly to the acidic eosin dye used in common stains. In Wright or Giemsa stains, this yields bright red or orange granules, a hallmark that helps distinguish eosinophils from other white blood cells. Basophil granules, in contrast, stain blue due to different constituents; neutral or white and yellow coloring don’t match the distinctive red appearance of eosinophil granules. So the correct statement is that eosinophil granules are red.